Magnetic alloy



Patented Dec. 29, 1931 0f the alloys in the l0 UNITED s'rn'ras PATENTOFFICE SYDNEY IBECKINSALE, OF BELVEDERE, KENT, ENGLAND MAGNETIC ALLOY NoDrawing. Application-filed July 8, 1931, Serial No. 549,569, and inGreat Britain July 14, 1930.

This. invention relates to magnetic materials formed of alloys in whichthe principal constituents are nickel and iron. In accordance with thisinvention we form such analloy of nickel, iron, silver and manganese.Copper and silicon a ents of the alloy. The addition of manganese I withsilver improves the working properties process to which they aresubjected during the manufacture of wire, strip or powder. In additionproved working properties the manganese acts as a deoxidizer. I

The silicon can be omitted or the constituents, manganese and silicon,can be used together in dependence upon the properties required for thealloys.

' tion of wire The constituents of the alloys may be in the followingrange of proportions Nickel from 25% to 80% Iron from 15% to Silver fromabout .05% to 10% Copper up to 10% Manganese from about .1 to- 10%-These alloys have a high permeability which makes them suitable for useon telephone cable transmission, and the more duo tile of the alloys aresuitable for being used in the form of wires and tapes as well as pow-.

der for pupin coils.

These alloys are in two series: (a) those low in silver and suitable forthe producand strip by hot working processes, (6) those with silvercontents exceeding 0.5% and, particularly suitable for the production ofpowder by a pulverizing process.

An alloy which has been found suitable for This" alloy may also be madeinto dust by processes other than pulverizing.

may also form constitu-' to giving im-- Typical alloys for theproduction of powder by a pulverizing process are the following:-

(a) Per cent Nickel 77 Iron 20 Cppper 0.05 Manganese 0.75 Silver 2.01Silicon 0.2

Nlckelfi 37.5 Iron 1 57 Copper 1 Manganese -1. 0.5 Silver 3 Silicon 1The permeability of the alloys may be improved by heat treatmentconsisting of annealing at 900 0. followed by slow cooling. What I claimas myinvention and desire a to secure by Letters Patent is 1. Highpermeability -magnetic' alloys comprising nickel, iron, silver andmanganese.

2. High permeability magnetic alloys comprising nickel, iron, silver,manganese and copper.

3. A high permeability magnetic alloy having constituents in thefollowing range of proportions Nickel from 25% to 80% Iron from 15% to60% Silver from about .05% to 10% Copper u to 10% anganese from about.1; to 10% 4. A high permeability magnetic alloy,

suitable for the production of wire or strip, having the followingcomposition Percent Nickel Iron 21.1 Copper 0.05 anganese 0.75 Silver0.1

5. A high permeability magnetic alloy,

suitable for the production of powder by a pulverizing process, halvingthe following composition Percent Nickel opper Manganese 0.75 Silver 2.0Silicon- 0.2

6. A high permeability magnetic alloy,

Suitable for the production of powder by a pulverizing process, havingthe followmg composition Per cent Nickel Iron 57 Copper .1 Manganese 0.5Silver 3 Silicon f 1 In testimony whereof I aflix my signature.

SYDNEY BECKINSALE.

